CONFIG_RTE_CB_MULTI is not available for thedefaultarchitecture x86.
Result is shown for architecture v850

Multi monitor ROM support

modulename: rte_cb_multi.ko

configname: CONFIG_RTE_CB_MULTI

uClinux/v850 (w/o MMU) Kernel Configuration
└─>Processor type and features
└─>Multi monitor ROM support
In linux kernel since version 2.6.21 (release Date: 2007-04-25)  
source code:
arch/v850/kernel/rte_cb_multi.c